button {
    margin: 10px;
    padding: 10px 20px;
    font-size: 18px;
    border: 2px solid #ccc;
    border-radius: 8px;
    transition: all 0.2s ease;
}

/* :hover 鼠标悬停时 */
button:hover {
    background-color: lightblue;
    border-color: blue;
}